Mapping onto Datapath Control
Relationship between register transfer and microoperations:
Register Transfer Microoperations
PC + 1 ? PC PC + 1 ? PC (delayed);
PC ? MAR PC ? ABUS (immediate),
MAR ? Address Bus MAR ? Address Bus (immediate);
Data Bus ? MBR Data Bus ? MBR (delayed);
MBR ? Data Bus MBR ? Data Bus (immediate);
MBR ? IR MBR ? ABUS (immediate),
MBR ? AC MBR ? MBUS (immediate),
MBUS ? ALU B (immediate),
ALU Result ? RBUS (immediate),